All things considered, it went about as well as it could have. We called them together and W told them there were going to be some changes, including we are getting a D. We both assured them this had nothing to do with them and that we both loved them very much and always will, regardless of circumstances.
Some tears from W and S11, and S19 was pretty stoic. W then left to go see her sick mother. I was expecting the worst, so it's a pretty big relief that it's over, to be honest.